It shows: boost @1.44.0_0 (active) boost-jam @3.1.18_0 (active) I think I've installed boost correctly, and following lines are in my bashrc: CPATH=/opt/local/include LIBRARY_PATH=/opt/local/lib PATH=/opt/local/bin:$PATH source ~/ros/setup.sh ----- 程晔 Simon -- View this message in context: http://ros-users.122217.n3.nabble.com/Problem-with-installing-C-Turtle-on-MAC-tp1422205p1422744.html Sent from the ROS-Users mailing list archive at Nabble.com.